Doki-Doki Universe is a unique adventure game developed by HumaNature Studios and published by Sony Interactive Entertainment. The game is designed for Play Station 4 and is the only game within the IP. The game's main focus is on personality measurement during the gameplay process.

The game's plot revolves around a robot named QT3, abandoned by humans due to his lack of emotions, which led him to fail the "humanity test." The main story arc is about QT3's ability to experience feelings. Alien Jeff comes to visit him after forty years of isolation to check whether he has gained any sentiments whatsoever.

The game's core feature is the player's perception of himself as he proceeds through the narrative structure of the game. The gameplay primarily consists of Jeff and QT3 visiting planets and evaluating moral choices on each one. The planets look unique and cartoon-like and are painted individually, without the procedural generation of the environment. The player needs to figure out the likes and dislikes of the planet residents using summonables, which are pictures that every character may react to differently. Depending on the choices made, including both randomly picking planet color and thoughtful decisions about the fates of the living creatures dwelling on a planet, the game measures the player's personality.